Pilot-bore vs taper-lock: what we actually machine

Pilot-bore means we have metal to remove. You give us a finished bore and a keyway (width × depth × whether it is a full or part key) and we cut it here. Typical hubs 30–250 mm. Bring the shaft if the drawing and the shaft disagree — they often do.

Taper-lock is a bush plus a tapered mating bore. We hold common bushes (1610, 2012, 2517 and up). You do not bore a taper-lock hub with a parallel reamer and then wonder why it will not pull up.

If you are not sure which you have, send a photo of the end of the hub. The bush screws are visible. A blank end with a small hole is a pilot.

Same-day is realistic when the hub is on the shelf and the bore is in the usual range. Splines and unusual keyways are a longer conversation, not a no.